-03- 



•02 



■ r I I I I I I I I I ■ I 1 I ■ I 1 I I I I I I I L 1 I I 



'01 



;:4. ' I' l I 1^ I I I I [ I I I ' l I I I' l I I I I I I I I I I I I I I I I 



SEC. -01 OZ 03 



c 



03 



■CZ- 



. I I . t I 1 ■ I , I , L I . . I L I I I I 1 I I I I I 



Fig. 30. 



Curve of action current of the musculus sartorius excitated by two suc- 

 cessive stimuli (St. 1 and St 2>. Tlie effect of the second stimulus 

 is tiie less and the latent period is the longer the more quickly the 

 first stimulus is followed by the second. (Keith Lucas.) 



